Window treatment accessory



FIG. 1 is a perspective view of the claimed window treatment accessory;

FIG. 2 is a front view thereof the rear view, the top plan view and the bottom plan view being mirror images of the front view;

FIG. 3 is a right side view thereof; and,

FIG. 4 is a left side view thereof.

The broken line showing of a cut-away portion of a window treatment is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a window treatment accessory, as shown and described. 